pond heaters..how much

[rossb]

This is actually a good idea. I have given some thought to doing this, and wrapping it around an exhaust stack for a water heater.

I was also trying to figure how much electricity the trough heaters use to see if it iw worth doing this. They are 1.5 Kw heaters, but they only come on at about 34 degrees.

Maybe both would be a good idea.